Boot insert



FIG. 1 is a front and side perspective view of a boot insert showing our new design with the upper portion of the boot insert shown in an unfastened condition;

FIG. 2 is a top plan view of the boot insert of FIG. 1;

FIG. 3 is a bottom plan view;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view; and,

FIG. 6 is a side elevational view. 

The ornamental design for a boot insert, as shown and described. 